Relaxations as key to the magnetocapacitive effects in the perovskite manganites.
Relaxations as key to the magnetocapacitive effects in the perovskite manganites.
复制标题
DOI：
10.1103/physrevlett.102.207208
复制
发表时间：
2008-09
影响因子：
8.6
通讯作者：
F. Schrettle;P. Lunkenheimer;J. Hemberger;V. Ivanov;A. Mukhin;A. Balbashov;A. Loidl
中科院分区：
文献类型：
--
作者：
F. Schrettle;P. Lunkenheimer;J. Hemberger;V. Ivanov;A. Mukhin;A. Balbashov;A. Loidl
我们提出了一个详细的介电弛豫效应发生在几个钙钛矿稀土锰氧化物，包括多铁性TbMnO（3）和DyMnO（3）的研究。我们表明，强的磁电容效应，观察到的电场E平行C，几乎完全由磁状态引起的弛豫参数的变化。多铁性材料，它经历了一个过渡到一个螺旋磁状态，表现出定性不同的弛豫行为比那些化合物转移到一个A型反铁磁状态。我们将这两种情况下的弛豫归因于锰离子的偏心运动，这在多铁性系统中也导致了铁电有序。
We present a detailed dielectric study of the relaxation effects that occur in several perovskite rare-earth manganites, including the multiferroics TbMnO(3) and DyMnO(3). We demonstrate that the strong magnetocapacitive effects, observed for electrical fields E parallel c, are nearly completely governed by magnetic-state induced changes of the relaxation parameters. The multiferroic materials, which undergo a transition into a spiral magnetic state, show qualitatively different relaxation behavior than those compounds transferring into an A-type antiferromagnetic state. We ascribe the relaxations in both cases to the off-center motion of the manganese ions, which in the multiferroic systems also leads to the ferroelectric ordering.